Seeing that they are now usable I am curious how many people are going to try them out. I know they are pretty expensive
At current exchange rates and difficulty levels, the dual-FGPA board will produce just under 0.12 BTC per day, which is worth about $1.22 USD. Calculated using the typical U.S. residential rate the cost of electricity to run this board for a day is under $0.04 USD, or about 3% of revenue. For comparison, when GPU graphics cards are used for mining the cost of electricity can exceed half the miner’s revenue in regions where electric rates are high.
The cost of electricity is not the only consideration however. Many of those mining would like to add capacity but have hit the limit where more GPU equipment would cause breakers to start popping, would require additional physical space, or would require additional methods to remove the heat produced.
They are shooting for 70 units to get the per-board production costs down. I would not be surprised if they exceed that target.